Metallic tubiws



n. 624,956, MQDGLW Patesitd Mayl, |899.

' l a, 1 METALLW? ,'iUBING.

, (Application mea m. 4', 189s.)

(No Model.)

A TTORNE Y.

V producing 'seamless tubing, as vwilLbel fully disclosed in thefollowing speciiicatiou'and l THOMAS MIDGLEY, OF COLUMBUS, OHIO,ASSIGNOR OF TWO-THIRDS TO GEORGE O. .URLIN AND LEWIS FINK, OF SAMEPLACE.v

METALLIC TUBING.

SPECIFICATION forming* part 0f Letters Patent N0.1624,956, dated Mary16, 1899.

Application filed November 4, 1898. Serial No.. 695,4'7-6. (No model.) l

To aZZ whom t may con/cern.-

Beit known that LTHOMAS MIDGLEY, acitizen of the United States, residingat Columbusin the county of Franklin and State of Ohio, have inventedcertain new and useful Improvements in Metallic Tubing; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make anduse the same.

My invention relates to tubing, has especial reference to that class oftubing which is made of sheet metal, and consistsin certain improvementsin construction whereby tubing is made of multiple concentric sectionsof metal metallically joined together and claims. v

In the accompanying drawings, which form part of this specification,Figure l represents a perspective of two split tubes in position'to` beassembled; Fig. 2, a transverse section of the tubes assembled; Fig. 3,a like v iew of the completed tube; Fig. 4, a side elevation of amodified form of the assembled tubing with.

parts broken away; and Fig. 5 a transverse section of the tubing on linefr, Fig. 4.

Reference being had to the drawings and the 4letters thereon,'Aindicates the tubing, made of sheet metal, in multiple concentric openor split sections' a b, which are formed of sheets of metal, suchas'steel or iron, preferably steel, bent intotubular form, with theedges c d abutting, and are assembled, or.one

pushed into the other, with the edges ofone tube overlapping or out ofline with the edges of the other tube, and preferably opposite eachother, as shown in Figs. l and 2. This disposition of the joints e ofthe tubes imparts strength and rigidity to the tubing and reduces thepossibility of leaking to a minimum.

The sections a b are made to fit closely one within the other and may beof dierent gage sheet metal, according to the Weight and strength oftubing required.

To produce a still heavier grade of tubing,

the inner section agis surrounded by a spirallywound section b', and theouter section b inin the tubing and the sections have been per# lmancntly joined together bythe molten metal and the tubing coated with anon-corroding metal, preferably brass, on its interior and exteriorsurfaces g and f. Tubing thus constructed to all intents and purposesforms brass tubing, the body of which is steel or iron, and produces `anarticle of manufacture which can be substituted for brass tubing at agreat reduction in cost and'capable of resistingl greater strain'andrough usage;`

The tubing may be used for conducting fluids for various purposes and isadapted for the general use of tubing, such as condenser and boilertubes and bicycle-frames.` l

The ends of the tubing may be screw-thread'n ed or flanged for joiningor connecting one piece to another in' the usual manner..

When lused for bicycle-frames, 'the tubing is made slightly thicker thanrequired when finished, and after ithas been metallically joinedtogether in the bath of molten metal the outer coating g of metal fromthe bath is` removed by the use of acid or by abrasion and the tubedrawn through a die and over a mandrel in the usual manneriofiinishingseamless tubing.`

what I claim is-da Having thus fully described my invention,

metallic sections, metallically joined together 4 and the-inner surfacecoated with soft metal. 2. Tubing composed of multiple concentricmetallic sections of hard metal joined together by an interposed body ofsoft metal and hava .ing the inner surface of the tubing coated withsoft metal.

3. Tubing composed of multiple concentric metallic sections brazedtogether and the inner surface coated with brass.

4. Tubing composed of multiple concentric i metallicv sectionsof vhardmetal with their roo joints overlapping, metallically joined to-4tubular metallic sections one of which is spiral' and brazed together.

6. Tubing composed of inner and outer tubular metallic sections and anintermediate spiral tubular sectionbrazed together.

7 Tubing composed of multiple concentric tubular metallic sections, oneof which is spiral, brazed together and the inner surface coatedwithsoft metal.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS MIDGLEY.

Witnesses:

JOHN W. WILSON, E. DE FOREST.'

